Telephone line unit having programmable read only memory

(19)

(11)

EP 0 486 888 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	09.06.1993 Bulletin 1993/23

(43)	Date of publication A2:
	27.05.1992 Bulletin 1992/22

(21)	Application number: 91118972.8

(22)	Date of filing: 07.11.1991

(51)	International Patent Classification (IPC)⁵: H04Q 11/04

(84)	Designated Contracting States:
	AT BE CH DE ES FR GB IT LI NL SE

(30)

Priority:

20.11.1990 US 616175

(71)	Applicant: ALCATEL N.V.
	NL-1077 XX Amsterdam (NL)

(72)	Inventors:
	Sanders, Gus Clint Raleigh, North Carolina (US) Rzonca, Richard Roger Raleigh, North Carolina (US) Czerwiec, Richard Marion Raleigh, North Carolina (US) Hurlocker, Claude Melvin Raleigh, North Carolina (US) Rice, Benjamin McHenry Newport, Rhode Island (US) Gingell, Michael John Raleigh, North Carolina (US)

(74)	Representative: Pohl, Herbert, Dipl.-Ing et al
	Alcatel SEL AG Patent- und Lizenzwesen Postfach 30 09 29 70449 Stuttgart 70449 Stuttgart (DE)

(56)

References cited: :

(54)	Telephone line unit having programmable read only memory

(57) A line unit, used in a line shelf having a line shelf processor and common logic, is provided with an EEPROM device for storing information relative to the line unit. The stored information includes line unit type identification codes, auto provisioning data, gain and equalization adjustment data and signaling translation tables. The data contained within the EEPROM may be utilized by the line shelf processor to provide automatic initialization and provisioning of the line unit when first inserted into the line shelf, and automatic signaling translation so that line unit signaling becomes compatible with a transmission facility connected to the line shelf. The need for factory preset resistors installed in the line unit may be eliminated by storing within the EEPROM a required gain setting.

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